The National Thowheeth Jama’ath (NTJ) group gave the noms de guerre of seven people it said were behind the “blessed attack” that targeted Christians during their “blasphemous holiday”.

Inside factory where Sri Lanka jihadists plotted to slaughter Christians: ‘Mother of Satan’ explosive used in attacks ‘were made in workshop owned by one of the suicide bombers’

The bombs are thought to have been made in a copper factory in Wellampitiya, a suburb of Colombo

It was owned by businessman and father-of-four Inshaf Ahamad, who blew himself up at a hotel on Sunday

Police raided the copper factory last night and took nine suspects – including the manager – into custody

At least 290 360 people were killed and 500 wounded after eight explosions hit hotels and churches

Sunday’s bombings targeting churches and high-end hotels are among the deadliest such attacks worldwide since the 2001 strikes on the United States.

The Sri Lankan government on Tuesday blamed the little-known National Thowheeth Jama’ath (NTJ) Islamist group for the blasts, saying they were carried out in retaliation for last month’s attacks on two mosques in New Zealand. (That’s debunked as humbug.)

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‘We had no idea what they were planning. If we had, we would have immediately told the police.’

Inshaf is said to have attacked the Cinnamon Grand hotel where retired fireman Bill Harrop and his wife Sally were killed, while his brother Ilham targeted the Shangri-La, massacring British lawyer Ben Nicholson’s wife and two children.

The factory (pictured) was owned by middle-class businessman Inshaf Ahamad, who blew himself up at a hotel

The factory was yesterday raided by police, who took nine suspects into custody, including its manager, supervisor and technician

The factory is believed to be the place where the ‘mother of Satan’ suicide bombs were built before they were detonated on Easter Sunday in Colombo

Inshaf, a father-of-four in his mid-thirties who owned the factory, had told his wife that he was going to Zambia on a business trip before he set off the deadly bomb

Their father, a successful spice trader, was arrested at the family home after bombs went off at the family home, killing three police officers.

Ashkhan went on: ‘We feel no emotion apart from anger. Pure anger. They were successful men with everything to live for.

He said his sister, Ishfan’s wife, was ‘living in a dream world’ following the massacre.

‘She can’t believe it really happened. She is in great psychological pain.’

After obtaining the material for the bomb, Inshaf, a father-of-four in his mid-thirties, told his wife that he was going to Zambia on a business trip, Mr Alamdeen said.

Inshaf was described by one of the workers at the factory as a ‘calm and devout’ Muslim, although he never wore the traditional dress

Police believe this is the location used to build the suicide vest using the explosive substance triacetone triperoxide – dubbed ‘Mother of Satan’ by Al Qaeda

Jeremy Hunt condemns ‘sickening’ attack on Christians in Sri Lanka

She dropped him off at the airport on Friday in time for an 6:50pm flight. They had been married for 10 years.

‘It was not a normal goodbye,’ Mr Alamdeen recalled. ‘My sister said he seemed shifty. He was tapping his neck and acting strangely. Then out of the blue he told her to be strong.’

The terrorist, who had eight siblings, phoned his wife one last time at 7:30am on Sunday, an hour before the attack, to say his final goodbyes.

‘He told her that he was in Zambia and everything was fine,’ Mr Alamdeen said. ‘Then an hour later he was dead.’

Inshaf’s copper factory was raided last night by police, who took nine suspects into custody, including the manager, supervisor and technician.

A group of men who work at the Copper factory that was raided on the outskirts of Colombo. They are not among those arrested by police

Triacetone triperoxide was also used in both the 2017 Manchester bombing and 2015 Paris Bataclan attacks

The investigation is ongoing, but detectives believe the location was used to build the suicide vest using the explosive substance triacetone triperoxide, dubbed ‘Mother of Satan’ by Al Qaeda for its destructive power.

The substance, a calling card of Islamist terrorists, played a role in both the 2017 Manchester bombing and 2015 Paris Bataclan attacks.

When MailOnline visited the factory, about 11 Indian and Bangladeshi immigrants were there, saying they felt ‘very nervous’.

‘The police have come here many times and looked at everything,’ said Mohammad Sarowan, 25, from Bangladesh. ‘We have done nothing wrong. We are innocent. They are interested mainly in the Sri Lankans.

‘This factory is our life. We live here and work here and we are paid $150 a month. Now the boss has gone and police are here every day.’

Mohammad Sarowan, 25, a Bangladeshi national who works at the copper factory. ‘We have done nothing wrong. We are innocent. They are interested mainly in the Sri Lankans,’ he said

Inshaf’s brother-in-law said that he last saw the bomber three days before the attack when he came over for a dinner of coconut roti.

‘We had a conversation about going camping. There was nothing strange about him at all,’ he said.

‘He was no more religious than anyone else and was just a perfect guy with everything to live for. His kids are aged eight, six, four and two.

‘Even now, I don’t want to believe it. Who would expect something like this in their family?’

Born in the city of Kandy in central Sri Lanka, Inshaf attended the respected D. S. Senanayake College in Colombo. He lived with his family in an apartment in the Dematagoda district of Colombo owned by his father.

It was this apartment that blew up when police raided it, killing three officers, Mr Alamdeen said.